How to select progressive cavity pumps
- Viscosity: The more viscous a fluid is, the lower the operating speed of the pump should be (PC pump efficiency is highest at slower speeds).
- Temperature: Stator material must correlate with the fluid temperature. Not only this, but the size of the pump is key here as rises in fluid temperature will result in the expansion of the elastomer stator. Moreover, it is also key to mention that high viscosity and temperature sensitive materials may result in maintenance concerns with other pumps that may provide a faster rate of flow.
- Flow rate & Pressure: Although PC pumps may be disregarded as they are typically more efficient when operating at lower speeds. More viscous, abrasive, and temperature-sensitive materials can cause problems in pumps that may offer higher flow rates, thus indicating PC pumps are excellent for such pumping applications.
As well as this it is key to understand that...
The higher the abrasive properties of the fluid the better to select a larger pump and run it slower than a smaller and faster pump. Although this may come across as more expensive, this is likely to improve your return on investment, and in the long-term reduce costs on maintenance expenses. Moreover, If you are operating with more abrasive fluids it is suggested that you reduce the pressure per stage.
For more information on pumping Abrasive fluids click here...
In order to maximise resistance to wear, it is ideal to select a design to keep the linear fluid velocity less than seven feet per second, but realize that solids can fall out of suspension at velocities less than four feet per second.